Fix reference error

The l3 agent class refers to the metadata agent class
incorrectly. This commit updates the name of the reference
so that it is valid.
change network defaults

This commit changes the default names
of many of the database parameters.

In a previous commit, they were changed from
quantum to network. This comit changes them to
be the same as $kickstack::network_type in order to
be more consistent with the older version.